body {
  color: #666;
  text-align: center;
}
.avatar {
  width: 200px;
  height: 200px;
  margin: 50px auto;
  cursor: pointer;
  opacity: 0.5;
}
.avatar {
  border-radius: 50%;
  transition: 0.5s;
}
.avatar:hover {
  box-shadow: 0 0 3px rgb(0, 0, 0);
  opacity: 1;
  transform: scale(1.5) rotate(1turn);
}